Analise filogenetica da familia Teiidae (Squamata, Reptilia), a ultra-estrutura de espermatozoide e a sua utilidade filogenetica

AUTOR(ES)

Ruscaia Dias Teixeira

DATA DE PUBLICAÇÃO

2003

RESUMO

Several studies have attempted to clarify the relationship among the teiid genera, based on several types of morphological data sets. Therefore, the relationships among teiid genera are not completely solved. Increase the number of characters, using new sources of characters, the sperm ultrastructure, and additional traditional morphological characters such as hemipenis, scales, and tongue were included to possibly improve the resolution of Teiidae phylogenetic hypotheses. The proposals of this work are (1) to clarify the phylogenetic relationships of teiids, (2) to expand the knowledge on the new data set, sperm ultrastructure, investigating the level of variability in sperm ultrastructure, in order to reveal intergeneric stability of characters, and (3) to evaluate the usefulness of sperm ultrastructure characters in phylogenetic reconstruction at the generic level. Comparative studies among teiid genera indicate high levels of inter and intra generic levels of variability in sperm ultrastructure characters, suggesting a spliting of genera in species as terminals, in order to give more accurate estimates of phylogeny. Despite the fact that phylogeny derived from the combined data show high levels of incongruence with those of previous studies, it reflects favorably the evolutionary history of the family due to the high number of characters applied (those data sets used in the previous hypotheses, combined with meristic, tongue, hemipenis and sperm ultrastructural data), surely improving the estimates of teiid relationships. Sperm ultrastructure may be a good indicator of phylogeny, producing topologies with major areas in congruence with the traditional morphological phylogeny, having on1y few incongruent areas weak1y supported by the traditional topology

ASSUNTO(S)

evolução reptil espermatozoides filogenia

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